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Unconsolidated Investments - Additional Information (Detail)
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9 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
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Sep. 30, 2014
Grand [Member]
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Dec. 31, 2013
Grand [Member]
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Sep. 30, 2014
South Kent [Member]
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Dec. 31, 2013
South Kent [Member]
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Jun. 25, 2014
E1 Arrayan [Member]
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Dec. 31, 2013
E1 Arrayan [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||
| Percentage of ownership | 45.00% | 45.00% | 50.00% | 50.00% | 70.00% | 31.50% |
| PPA of project | 20 years | 20 years |